Lensatic Compass or Baseplate Compass: Which One is Right for You?
Serious outdoor enthusiasts are divided on the question of whether to pack a lensatic or baseplate compass. Here’s a quick rundown of the differences between these two types of compasses in terms of ease of use, precision, and packability to help you take sides.
The Difference Between a Lensatic and Baseplate Compass
A baseplate, or protractor compass, has a clear, plastic base that can be used as a protractor on a topographic map, and a magnetic needle that swings in a capsule filled with fluid to dampen quick movements of the needle. The most accurate models have a folding mirror that allows the user to read the compass (reflected in the mirror) while sighting distant objects.
A lensatic compass uses a lens to allow the user to read the compass bearing with just a quick downward glance while sighting. These compasses generally use a magnetic disk rather than a needle, and dampening with either fluid or, in the best models, electromagnetic induction.
Ease of Use
Both types of compass require a little study and practice, and neither have a clear advantage in ease of use. The lensatic compass may have a slight advantage in initial comprehension for beginners because the direction seen through the lens is always the way you are facing. With a baseplate compass, the dial (bezel) has to be set before the bearing can be read. A disadvantage of the lensatic is the lack of a magnetic declination adjustment—this correction has to be done mentally, which is not a big deal, but introduces an additional opportunity to make a mistake.
Compass Precision
Used properly, both types of compass can produce reasonably precise readings, but the lensatic compass has a slight edge. The narrow, magnified field of view seen through the lens, with just a glance down to read the direction, is a powerful combination. However, for most outdoor recreational activities like backpacking and hunting, a degree or so extra precision probably isn’t going to be the deciding factor.
Packability
Weight and bulk are factors to consider, especially if you do long-distance backpacking, lightweight expeditions, or any other activity where every ounce makes a difference. High-quality mirrored baseplate compasses weigh less than 3 ounces and have a slim profile of just over a half inch. The rugged, aluminum Cammenga Model 27 is twice the thickness and twice the weight, but it is very durable, and has no liquid, so leaks are not an issue.
